PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

T251Transformer,audio Frequency

Electronic Transformer Corp Div Electronic Transformer Corporation · NSN 5950-00-645-5207 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-00-645-5207 — this item is cataloged by the U.S. Government under National Stock Number 5950-00-645-5207. Primary manufacturer part number: T251.
Features
  • Transformer,audio Frequency — FSC 5950
  • Impedance Rating in Ohms: 10000.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY
  • Center to Center Distance Between Mounting Facilities Parallel to Width: 1.812 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
  • Mounting Hole Diameter: 0.169 INCHES NOMINAL SINGLE GROUP IN
  • Body Width: 2.375 INCHES NOMINAL IN
  • Maximum Transformer Power Rating: 1.0 WATTS SINGLE COMPONENT
  • Mounting Method: UNTHREADED HOLE(S) SINGLE GROUP
  • Primary to Secondary Turn Ratio: 1 TO 2-3/10 SINGLE COMPONENT
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transformer,audio Frequency, cataloged under National Stock Number 5950-00-645-5207, is classified within Federal Supply Class 5950 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Electronic Transformer Corp Div Electronic Transformer Corporation. Government technical data includes 17 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5950-00-645-5207
Primary Part NumberT251
Item NameTransformer,audio Frequency
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerElectronic Transformer Corp Div Electronic Transformer Corporation
StatusCANCELLED
Impedance Rating in Ohms10000.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY
Center to Center Distance Between Mounting Facilities Parallel to Width1.812 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Mounting Hole Diameter0.169 INCHES NOMINAL SINGLE GROUP IN
Body Width2.375 INCHES NOMINAL IN
Maximum Transformer Power Rating1.0 WATTS SINGLE COMPONENT
Mounting MethodUNTHREADED HOLE(S) SINGLE GROUP
Primary to Secondary Turn Ratio1 TO 2-3/10 SINGLE COMPONENT
Center to Center Distance Between Mounting Facilities Parallel to Length2.125 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
Body Length2.750 INCHES NOMINAL IN
Terminal Type and Quantity4 TAB, SOLDER LUG
Winding Function and Quantity1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT
Impedance Rating in Ohms1900.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY
Body Height3.188 INCHES NOMINAL IN
Mounting Facility Quantity8 SINGLE GROUP
Inclosure TypeFULLY INCLOSED
Frequency Rating60.0 HERTZ MINIMUM AND 8.0 KILOHERTZ MAXIMUM SINGLE COMPONENT
Reliability IndicatorNOT ESTABLISHED
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 3
3110-00-117-0779 INTERCHANGEABLE
Bearing,roller,thrust
5940-00-259-9057115704-001 INTERCHANGEABLE
Terminal,lug
Bae Systems Information and Electronic Systems Integration Inc. Dba Bae Systems
5310-01-122-9066T-251 INTERCHANGEABLE
Washer,flat
Caterpillar Inc Div Caterpillar Defense
Cross-Reference Index
Part NumberManufacturer
T251 PRIMARY Electronic Transformer Corp Div Electronic Transformer Corporation (USA)
Related Parts
3110-00-117-0779INTERCHANGEABLE
BEARING,ROLLER,THRUST
5940-00-259-9057INTERCHANGEABLE
TERMINAL,LUG
115704-001
5310-01-122-9066INTERCHANGEABLE
WASHER,FLAT
T-251

Frequently Asked Questions

What is NSN 5950-00-645-5207?

NSN 5950-00-645-5207 is a Transformer,audio Frequency, manufactured by Electronic Transformer Corp Div Electronic Transformer Corporation, classified under FSC 5950 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5950-00-645-5207?

NSN 5950-00-645-5207 has 1 cross-referenced part number: T251 (Electronic Transformer Corp Div Electronic Transformer Corporation).

What NSN replaces 5950-00-645-5207?

There are 3 known substitutes for 5950-00-645-5207: 3110-00-117-0779, 5940-00-259-9057, 5310-01-122-9066. Verify interchangeability with system specifications before substitution.

What are the specifications of T251?

Key specifications for T251: Impedance Rating in Ohms: 10000.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY; Center to Center Distance Between Mounting Facilities Parallel to Width: 1.812 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN; Mounting Hole Diameter: 0.169 INCHES NOMINAL SINGLE GROUP IN; Body Width: 2.375 INCHES NOMINAL IN. 17 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5950-00-645-5207 still in active supply?

NSN 5950-00-645-5207 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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